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Light Localization and Magneto-Optic Enhancement in Ni Antidot Arrays
(Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern)
(Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2016 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 16, no 4, 2432-2438 p.Article in journal (Other academic) Published
Abstract [en]

We reveal an explicit strategy to design the magneto-optic response of a magneto-plasmonic crystal by correlating near- and far-fields effects. We use photoemission electron microscopy to map the spatial distribution of the electric near-field on a nanopatterned magnetic surface that supports plasmon polaritons. By using different photon energies and polarization states of the incident light we reveal that the electric near-field is either concentrated in spots forming a hexagonal lattice with the same symmetry as the Ni nanopattern or in stripes oriented along the Gamma-K direction of the lattice and perpendicular to the polarization direction. We show that the polarization-dependent near-field enhancement on the patterned surface is directly correlated to both the excitation of surface plasmon polaritons on the patterned surface as well as the enhancement of the polar magneto-optical Kerr effect. We obtain a relationship between the size of the enhanced magneto optical behavior and the polarization and wavelength of optical excitation. The engineering of the magneto-optic response based on the plasmon-induced modification of the optical properties introduces the concept of a magneto-plasmonic meta-structure.

Place, publisher, year, edition, pages
2016. Vol. 16, no 4, 2432-2438 p.
Keyword [en]
Magnetooptical effects; collective excitations; surface plasmons polaritons; photoemission electron microscopy; magneto-plasmonic crystals
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-262659DOI: 10.1021/acs.nanolett.5b05279ISI: 000374274600045PubMedID: 27018661OAI: oai:DiVA.org:uu-262659DiVA: diva2:854743
Funder
Knut and Alice Wallenberg FoundationGerman Research Foundation (DFG), SFB/TRR 173German Research Foundation (DFG), DFG/GSC 266
Available from: 2015-09-17 Created: 2015-09-17 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Magnetoplasmonic nanostructures
Open this publication in new window or tab >>Magnetoplasmonic nanostructures
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Surfaces that are nanopatterned, metallic, and magnetic can support surface plasmon resonances, providing an alternative and effective way to reconfigure flat optical components. Utilising a range of near- and far-field characterisation techniques, the optical and magneto-optical properties of lithographically patterned thin magnetic films are investigated.

A magneto-optical diffractometer was designed, assembled, and commissioned to characterise periodic magneto-plasmonic nanostructures. For Ni and Co nanostructured antidot arrays, enhanced values of the magneto-optical Kerr rotation were recorded for energies and angles corresponding to excitations of surface plasmon polaritons. This enhancement was found to be thickness dependent. Modification of the optical properties via applied transverse magnetic fields and the excitation of surface plasmon polaritons, was demonstrated for an antidot array of pure Ni. The excitation was also shown to enhance the generation of second harmonics, as well as further activate nonlinear-optical mechanisms.

In order to fully resolve and explain the source of this remarkable magneto-optical activity, near field probing techniques were used. This allows for mapping the electric near-field with a sub-wavelength resolution, thereby revealing the interplay between the light and the nanostructured lattice. The measurements show that the electric near field intensification, induced by plasmon excitation, increases the polarisation conversion, which correlates to the observed magneto-optical Kerr rotation.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 58 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1439
Keyword
Magnetism, nanostructures, plasmons, magneto-optics, magnetoplasmonics
National Category
Condensed Matter Physics Atom and Molecular Physics and Optics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-305276 (URN)978-91-554-9724-8 (ISBN)
Public defence
2016-12-02, Polhemsalen, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Available from: 2016-11-09 Created: 2016-10-14 Last updated: 2016-11-16

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